Add secrets documentation

SECRETS.md

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+# Secrets for Woodpecker CI/CD
+# Set these in the Woodpecker Web UI for this repository
+
+# SSH_KEY: Base64-encoded SSH private key for docker-2.local
+#   Generate: base64 -w0 < ~/.ssh/id_rsa
+#   This allows Woodpecker to deploy to your Docker Swarm
+
+# TEAMS_WEBHOOK: Microsoft Teams webhook URL
+#   This allows Woodpecker to send deployment notifications
+#   Format: https://bryanfamily.webhook.office.com/...
+
+# To set secrets:
+# 1. Go to Woodpecker Web UI: https://woodpecker.bryanmail.net
+# 2. Select repository: homelab/compose-files
+# 3. Settings → Secrets
+# 4. Add SSH_KEY and TEAMS_WEBHOOK